Ceramic balls

Ceramic balls are mainly used in harsh environments. Their main advantages on steel is that they have a density 40% lower than steel, have 29% lower thermal expansion and are 150% harder. In certain high-speed applications their life is extended hundred times. It is also used as grinding media. There are three main types.

Alumina Oxide - ceramic balls

Composition

99.5% Al2O3 / 0.5% other

Hardness

1700 Hv

Ultimate Tensile Strength

31,000 psi

Ultimate Compressive Strength

>300,000 psi

Modulus of Elasticity

53 x106 psi

Maximum Working Temperature

1400oC

Corrosion Resistance

Inert except for hydruofluric, hydrochloric acid and
hot concentrated sulphuric acids. Inert to most substances, not recommended for environments of strong alkaline solutions

Zirconia Oxide - ceramic balls

Composition

97% ZrO2 / 3% MgO

Hardness

80 - 84 Ra

Ultimate Tensile Strength

60,000 psi

Ultimate Compressive Strength

285,000 psi

Modulus of Elasticity

29 x106 psi

Maximum Working Temperature

2400oC

Corrosion Resistance

Inert to most substances, not recommended for environments of hydrochloric or strong alkaline solutions